Repair and replacement cap for twisting machine heads



March 18, 1958 w. c. GUSTAFSON 2,826,392

REPAIR AND REPLACEMENT CAP FOR TWISTING MACHINE HEADS Filed March 22,1954 'INVENTOR WALTER c. GUSTAFSQN v .ATTORNEY United States REPAIR ANDREPLACEMENT CAP i on TWISTING MACHINE HEADS Walter C. Gustafson, Paxton,Mass. Application March 22, 1954, Serial No. 417,904

1 Claim. (Cl. 5777.3)

This invention relates to a new and improved repair and replacement capfor twisting machines having specific applicability to the twisting pinswhich in the conventional twisting head become worn and grooved, andalso the rim of the thread passage through the usual spindle which alsobecomes worn and grooved.

It is the principal object of the present invention to provide an easilyapplicable repair cap for twisting machine heads, said cap comprising adisc-like body having a central opening therein receiving and holding ahardened yarn guiding ring, and there being a pair of hardenedyarn-guiding and twisting pins located diametrically opposite each otherand extending from said body in a direction opposite to a flange on therim thereof whereby the worn pins on the twister head may be ground offand the new cap applied thereto as by a press fit, with the twister headreceiving the flange.

Further objects of the invention include the Provision of a repair capas above described wherein the inserted ring and the pins are made oftungsten carbide and will act to twist the yarn for a period of timethree or four times greater than that of the original equipment.

Other objects of the invention include the provision of a repair cap asabove described which enables the mill operator to quickly and easilyrepair his own twister heads without the necessity of sending thespindles out of the plant to a repair shop, thereby greatly savingexpense and time as well as providing a greatly improved machine.

Other objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawings, in which:

Fig. l is a view in elevation of a conventional twisting head;

Fig. 2 is a section showing the novel repair cap in place;

Fig. 3 is an enlarged view in elevation of the novel repair cap;

Fig. 4 is a top plan view thereof;

Fig. 5 is a bottom view;

Fig. 6 is an enlarged section through the cap;

Fig. 7 is a sectional view through a modified construction;

Fig. 8 is a section on line 8-8 of Fig. 7;

Fig. 9 is a section through a twisting head showing an application ofthe modified construction; and

Fig. 10 is a top plan view, looking in the direction of arrow 10 in Fig.9.

The conventional twisting head for twisting a loose roving or the likeinto a yarn or thread includes a spindle 10 rapidly rotated on its axisas by a pulley or whirl 12, and the spindle is provided with alongitudinal central passage 14 for the downward travel of the yarn orthread 16.

The upper end of the spindle is provided with a pair of shortlongitudinally extending eccentrically mounted pins 18 located the samedistance from the axis of the spindle diametrically opposite each other.These pins are rounded at their free ends which engage the roving ice 220 and give it a slight bump at each revolution. The roving or the like20 is fed in at the angle shown so that the pins cannot become entangledor the roving wound up on the pins.

These pins and also the edge of the rim of the opening at the entranceend of the thread passage 14 become worn and grooved by the passage ofthe material, and of course once grooved, these parts are useless fortheir intended purpose. Prior to the present invention, the milloperator removed the spindles from the machines and sent them back tothe factory for repair and overhaul, or else expensive machineoperations had to be done at the mill operators plant, changing theoutside diameter and the inside diameter of the twister in order toaccommodate prior art supplementary devices and to repair the head. Thisinvention, however, obviates the necessity for expensive andtime-consuming milling and grinding operations and also the necessityfor returning the spindles to the factory in the event that the milloperator was not equipped to machine his own spindles for repair.

The present invention is a cap comprising a generally circular flatdisc-like body or top wall 22 having a depending annular flange 24 atthe rim thereof. The lower edge of the flange 24 is inwardly bevelled tofacilitate positioning of the cap on the twisting head. This body has acentral aperture 26 with an inwardly-directed annular shoulder 28 at thelower edge thereof receiving and holding a tungsten carbide ring 30.This ring is rounded over at its inner aspect, providing a smooth, hardconvex guide surface for the thread or yarn, not heretofore available onthe twisting head. The material of the body 22 can be peened over at 32to hold the ring, or it may be press-fitted, shrunk on, etc.

The cap also has a pair of tungsten carbide pins 34 set in holes in thebody 22, equi-distant from the axis of the cap and diametricallyoppositely located. These pins are rounded at their free ends 36 and actin place of pins K when the latter are removed as by grinding them off,and the novel cap is set in place by cementing, shrinking, or press fitin the ordinary case where the original spindles have been held tospecified tolerance.

Figs. 7, 8 and 9 illustrate a modified form of the invention. Thereference numeral 38 indicates a spindle similar to that at 10 but inthis case instead of being provided with pins 18, it is provided withcross slots or diametrically opposed channels 40 which intersect aconical end depression 42, and in this case the yarn comes in at anangle greater than that shown in Fig. 1, see Fig. 7.

This invention contemplates a cap similar to that described above butprovided with the channels 44 which are like those at 40 of the originalspindle and intersect a conical formation 46 which is similar to that at42. In this case also, the new cap has a depending skirt for fitting theend of the spindle 38 and it is provided with the inserted tungstencarbide ring 48 which takes the wear of the yarn as clearly shown inFig. 8.

The cap of Figs. 7 and 8 may be applied to the spindle 38 without anymachine operations at all as is indicated in these figures, but ifdesired, the end of the spindle 38 may be cut off as shown in Fig. 9 at50 or it may be cut or ground off to the degree found necessary forproviding a good basis of support for the new cap.

Furthermore, the cap of Figs. 1 to 6 may be applied to the spindle 38and the cap of Figs. 7 and 9 may be applied to the spindle 1 0, so thatthe devices are made completely interchangeable.

The new cap will outwear the old pins by three or four times, and theinserted ring Will last as well. The mill operator does not have to sendthe worn spindle out for repair, but at less expense and in far quickertime, he can use the new cap which may be placed on the spindle in aPatented Mar. 18, 1958' his 'own shopjand thus obtain a better twisterhead than the-- originalt Having thus describedmy invention and theadvantages thereof, I do not wish to be limited to the details hereindisclosed, otherwise thanas-- setfortli-in'the'claim, butwhat I claimis:

A-deviee for repairing'a cylindrical twisting-machine head provided atthe top thereof with wornupstanding pins which have been severed priorto-repair flush with thetop-end ofthe head and also provided withanaxial bore, said device comprising a capof relatively soft materialpositioned on theupper-end portion of said head, said cap including atop wall abuttingthe top end of the head and adependingannularflange-frictionally embracing the side-wall of the head; the loweredgeof saidflange being inwardly bevelled tofacilitate positioning ofsaid cap on said head, the top wall of the cap being provided with acentral aperture and with an inwardly projecting annularshoulder atthebottom of said'aperture, a ring of relatively hard material mountedin said aperture on said shoulder and having an inside diameter'corresp'onding substantially tothe diameter of the bore-in said head,

a portion of said top wall at the top of said aperture being 'peened'inwardly over said ringto retainthe same References Cited in the file ofthis patent UNITED- STATES PATENTS 652,306 Weber June 26, 1900 1,774,371Hendrickson et a1. Aug. 26, 1930 2,291,819" McCann Aug. 4; 19422,557,591 Benson June 19, 1951 2,571,109 Carter Oct. 16, 1951 2,740,251Bierlin Apr. 3, 1956 2,753,679 Von Schmoller et al July 10, 1956 FGREIGNPATENTS 440,546 Italy Oct. 13, 1948 552,131 Great Britain -4 Mar.24,1943

